Improvement in mode of compensation for loss of motion



T. SHAW. v STROKEYREGISTER ATTACHMENT.

Patented Feb. '7, 1865.

UNITED STATES PATENT Orrtcna THOMAS SHAW, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIMSELF AND PHILIP S. JUSTICE.

Specification forming part of Letters Patent.- No. 46.309, dated February 7, 1865.

T0 all whom it may concern:

ured stroke; andI hereby declare the following to be a full, clear, and exact description of the same, reference being bad to the accompanying drawings, and to the letters of reference marked thereon.

My invention consists in the employment and adaptation of a spring to receive surplus motion, in the manner and for the purpose as hereinafter described.

On reference to the accompanying drawings, which form a part of this specification, Figure 1 represents the back view of the apparatus as applied to an engine counter; Fig. 2, the front or dial part of same.

a is a metallic case surrounding an ordinary recording-movement, 12. On the bottom of said case a is a brass boss, 0, into which is screwed brass pillar b, for supporting the same. (2 is a crankwheel secured on the end of the shaft that propels hand a. his a screw which serves as a crank-pin g is a jointed bearing for spring m. f is a small rod sliding through a bearing, 0. Spring k is jointed to crank-pin h and to the top of rod f at i, all for the purpose as hereinafter described.

The object of spring at is to pull and push crank-wheel d off the deadcenters when said wheel (1 is operated by the reciprocation of rod f.

It will be observed that Where an apparatus of this kind is operated by a rod of considerable length, or'where there are a number of joints intervening the expansion and contrac ion of the rod by heat and cold and any loss of motion in the joints will seriously aifect the operation of the movement, a1 d often cause it to cease operating. It is for this object that spring k is provided, as IIlO- tion can be given to rod f greater than is necessary for the operation of crank-wheel d, the surplus of motion being received by spring 7c, which arrangement will allow considerable loss of motion in rodfwithout afii'ecting the movement;

What 1 claim, and desire to secure by Lettors Patent. is-

The combination ofsprings 7; and m, crankwheel (1, and rodf, when connected with the recording-movement n, in order to operate engine-counters requiring a regular measured stroke, in the manner and for the purpose herein described.

THOMAS SHAW. [L. s] \Nitnesses:

J. HOWARD MITCHELL, EZRA Cnnsnnno. 

